Cycling glossary, A to Z.

Definitions here describe what a term means and who uses it; they are not instructions. Riding in traffic or off road, repairing or adjusting a bike, fitting a rider, charging a battery and anything to do with an injured rider are matters for a qualified instructor, a bike mechanic or a doctor. Every injury or condition named below needs medical care if it is suspected.

Rules are each body's published rule with its article and date, and they change: the body's current regulations and its officials decide. UCI technical rules are read from the Japan Cycling Federation's bilingual copy of the UCI clarification guide, whose edition date we could not confirm. Highway Code rules worded "should" are guidance, not law; US e-bike classes are state law. Where sources disagree, each version is given with who says it, and anything we could not confirm is labelled unconfirmed. Event results and seasons are as of 22 October 2026.

Jump to: 0-9 A B C D E F G H I J K L M N O P R S T U V W X Y

0-9

1x and 2x

Shorthand for a drivetrain with one chainring (1x) or two chainrings (2x) at the front. Wikipedia (secondary) says both are common on gravel bikes. (Groupsets and drivetrains)

3:1 rule

A former UCI limit that held components such as handlebars, seat posts and time trial bars to 8 cm maximum length, 1 cm minimum thickness and a length-to-width ratio of 3 to 1. It is no longer in force: the 2026 text, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide, has no 3:1 ratio and limits tube sections to between 10 and 80 mm. When it ended is disputed: BikeRadar (30 November 2022) dates its removal for components to the regulations from 1 January 2023, while Cycling Weekly headlines report that it was dropped earlier for frame tubes. (UCI equipment rules)

A

AB 1096 (California)

The California bill of 2015 that added Vehicle Code section 312.5, defining an electric bicycle as one with fully operable pedals and a motor of less than 750 watts and setting out Classes 1, 2 and 3. The motor wording is given two ways: the 2015 enrolled bill says "less than 750 watts", while a third-party host of the codified text, seen only in a search summary, gives "not exceed 750 watts". It is one state's law, recorded here as the example of the three-class system, not a national rule; the current text of section 312.5 and later changes were not checked. (E-bike classes and laws)

Advanced stop line

A layout of two stop lines named in Highway Code Rule 71, which says cyclists MUST NOT cross the stop line when the lights are red, and that at an advanced stop line the first line may be crossed but not the final one. Rules worded MUST are legal requirements in Great Britain. (Commuting kit)

Age categories (UCI)

The age groups in UCI Regulations Part 1 (version on 1 July 2026), Articles 1.1.034 to 1.1.037. A rider's category is the year of the event minus the year of birth (cyclo-cross has its own rule): Youth is 16 and under and is run by national federations, Junior (MJ, WJ) 17 and 18, Under 23 (MU, WU) 19 to 22 and Elite (ME, WE) 23 and over, with exceptions in BMX, trials and disciplines where riders count as elite younger. Which disciplines use a women's under-23 category today was not confirmed. (Licences and categories)

AIGCP

The association of professional road teams. The UCI says it suspended its road disc brake trial in April 2016 at the AIGCP's request, and the AIGCP was one of the four parties to the March 2015 agreement on an extreme weather action plan. (Disc brakes in racing)

AIOCC

The association of race organisers. With the UCI, the riders' association (CPA) and the teams' association (AIGCP), it agreed in Milan on 20 March 2015 on the need for an action plan for extreme weather in professional races, according to the UCI. (Heat and extreme weather)

AS/NZS 2063

The Australian and New Zealand bicycle helmet standard. Australia's Consumer Goods (Bicycle Helmets) Safety Standard 2024, a supply standard whose explanatory statement was registered on 21 March 2024, accepts its 2008 and 2020 editions alongside EN 1078:2012+A1:2012, US CPSC 16 CFR Part 1203, ASTM F1447-18 and Snell B-95; it excludes helmets for competitive downhill mountain biking and BMX racing. (Helmet standards)

ASTM F1447

A US bicycle helmet standard from ASTM International. Its 1993 edition was one of the standards named in the Children's Bicycle Helmet Safety Act of 1994 for the US interim rule of 1995, the CPSC added the 1994 edition, and Australia's 2024 supply standard accepts ASTM F1447-18. (Helmet standards)

AusCycling

Australia's national cycling body, which says it was formed in November 2020 from 19 separate governing bodies and is recognised by the UCI; Wikipedia (secondary) names the three national bodies merged as Cycling Australia, Mountain Bike Australia and BMX Australia. Its size is reported two ways: its own page (checked 22 October 2026) gives more than 50,000 members and 450 clubs, while a search summary attributed to its site gave over 54,000 members and 400 clubs. Both are AusCycling's own claims. (National federations)

AXS

SRAM's name for its wireless electronic component system. SRAM describes RED AXS as a fully wireless electronic road groupset; the weight and braking figures on its product page are SRAM's own claims. (Groupsets and drivetrains)

B

Balance bike

The children's bike that the City of Mannheim and the Technoseum call the direct descendant of Karl Drais's 1817 running machine, which the rider pushed along with the feet; they say the idea was rediscovered at the start of the 21st century. (The draisine and the velocipede)

Base bar

The steering system of a time trial handlebar. Under UCI Article 1.3.023, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide, a base bar must be at least 350 mm wide, outside to outside, and is allowed only together with a fixed time trial extension. (Time trial position rules)

Best Hour Performance

The separate category into which, under a UCI rule of 2000, Hour rides made from 1972 onward on modern aerodynamic equipment were moved, so that Eddy Merckx's 1972 ride again became the record to beat. road.cc (2014) calls it Best Hour Performance; Bikeraceinfo, a results site, calls it Best Human Effort and dates the split to September 2000, while search summaries of Wikipedia and Cyclist magazine place the change in 1997 (unconfirmed). The UCI's change of 15 May 2014 restored those rides as records set under the rules of their time. (The Hour record)

Bike computer size limit

A UCI Management Committee decision of 2 to 4 June 2026 that caps the size of bike computers at 126 x 71 mm from 1 January 2028. The UCI says the figure matches the largest units then on sale and aims to limit riders' cognitive load. (UCI equipment rules)

Bike fitting

Setting up a bike to suit a rider, named on this site but not described. The International Bike Fitting Institute (IBFI), whose launch Cycling Industry News reported on 30 May 2016, is a non-profit accreditation scheme that places fitters at one of four certification levels. In UCI racing a rider's position must stay within the saddle rules (Articles 1.3.013 and 1.3.014) and the time trial reach and height limits (Article 1.3.023), as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide. (Mechanics and bike fitting)

Bikeability

The cycle training programme in England, which the Bikeability Trust, a charity, says began in 2007 and runs on behalf of Active Travel England. Its levels are defined in the Department for Transport's National Standard for Cycle Training (June 2018): Level 1 in places free of motor traffic, Level 2 on simple roads and junctions, and Level 3 on busier or more complex roads, each level a prerequisite for the next. The National Standard also names Bikeability Plus modules, among them Balance, Learn to Ride and Fix. (Training and courses)

BMX Flatland

A BMX freestyle event. Descriptions of it as ridden on flat ground and judged on tricks, and of the UCI adding it to the Urban Cycling World Championships in 2021, rest on search summaries and are unconfirmed. Under UCI Article 1.3.031, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide, a helmet is not mandatory in BMX freestyle flatland or in indoor cycling. (BMX, trials and indoor)

BMX Freestyle Park

A judged BMX discipline in which riders perform timed runs of about one minute in a park, marked on difficulty, execution, style, originality, flow, height and amplitude, as the UCI describes it (2026). The UCI says it made its Olympic debut at the Tokyo 2020 Games, held in 2021. (BMX, trials and indoor)

BMX Racing

Head-to-head racing of up to eight riders on tracks usually about 350 to 400 m long, with jumps, rollers and banked corners, starting from a ramp 8 m high for elite riders, as the UCI describes it (2026). The UCI's BMX explainer says the International BMX Federation, created in 1981, held the first official world championships at Dayton, Ohio, in 1982, while the UCI's 125th-anniversary article puts the first BMX world championships in Italy, after BMX joined the UCI in 1985. The UCI says BMX Racing has been Olympic since Beijing 2008. At world championships and the Olympic Games a Last Chance Qualifier feeds the semi-finals. (BMX, trials and indoor)

Bone mineral density (road cyclists)

Olmedillas and colleagues (BMC Medicine, 2012; 31 studies) found adult road cyclists in regular training had low bone mineral density at key sites such as the lumbar spine, with some conflicting results, and concluded that road cycling gives no significant bone-building benefit. A suspected injury or condition needs medical care. (Injuries named)

Boneshaker

A name for the front-pedal velocipede of the 1860s. The University of Missouri Libraries (April 2023) say it appears to have originated in Paris around 1863. (The draisine and the velocipede)

Bonus seconds

Time taken off a rider's total in a stage race. Under UCI Part 2 (version on 1 July 2025), Article 2.6.019, bonuses may be given at up to three intermediate sprints per stage (3, 2 and 1 seconds) and at stage finishes (10, 6 and 4 seconds); Article 2.6.021 says they count only in the individual general classification and are not given in time trials. (Stage races and jerseys)

Bottle rule (UCI)

UCI Article 1.3.024 bis, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide: bottles may not be built into the frame, may sit only on the down tube and seat tube inside the frame, must have a cross-section of 4 to 10 cm and hold 400 to 800 ml, and an empty bottle may not be carried. (UCI equipment rules)

Breezer

The purpose-built off-road frames Joe Breeze began making in autumn 1977; Collectors Weekly says he made ten by spring 1978. The SFO Museum calls Breeze's 1977 bike the first modern mountain bike, while other accounts point to John Finley Scott's 1953 woodsie bike or Tom Ritchey's frames for Gary Fisher as rival firsts or near-contemporaries. (Mountain biking origins)

British Cycling

Great Britain's national cycling federation, formed in 1959 as the British Cycling Federation when the National Cyclists' Union and the British League of Racing Cyclists merged; an archive record agrees, but British Cycling's own history page could not be read. road.cc reported on 1 December 2025 that its annual report gave 117,475 members in the year to 31 March 2025, down from 128,663 a year earlier. (National federations)

C

CADF

The Cycling Anti-Doping Foundation, which the UCI says it created in 2008, the year it also introduced the biological passport. In 2021 the UCI handed its operational anti-doping work to the International Testing Agency (ITA). (Doping and official decisions)

CAN-BIKE

Cycling Canada's cycling safety programme. Cycling Canada owns the curriculum, sets delivery standards and lists courses from Level 1, Fundamentals of Cycling, for all ages including people who have never ridden, to Level 5 instructor training, delivered by certified local instructors. Sources differ on the length of Level 5: Cycling Canada's course page gives 24 hours, another listing seen in a search summary gives 12. (Training and courses)

Carbon fibre (frames)

A frame material that BikeRadar (2 January 2024) says has an excellent stiffness-to-weight ratio and can be moulded into aerodynamic shapes, its properties depending on the lay-up; most carbon frames are monocoque or tube-to-tube. BikeRadar notes it can be damaged in crashes, including internally, and is hard to recycle. (Frames and materials)

CAS (Court of Arbitration for Sport)

The sports tribunal whose rulings appear in cycling's official record. Canadian Cyclist reported on 30 June 2008 that CAS had dismissed Floyd Landis's appeal, confirming his disqualification from the 2006 Tour; Radsport-news reported on 6 February 2012 that CAS had banned Alberto Contador and that he lost his 2010 Tour and 2011 Giro wins. (Doping and official decisions)

#ChargeSafe

London Fire Brigade's campaign on e-bike and e-scooter battery fires, begun in 2023. On 28 January 2026 LFB reported a record 206 e-bike and e-scooter fires in London in 2025, 171 of them involving e-bikes, and names lithium-ion battery failure, conversion kits and chargers as frequent causes. The campaign's advice is LFB's own and is not reproduced here. (E-bike batteries and fire safety)

Class 1, 2 and 3 e-bikes

The e-bike classes of US state law, as California's AB 1096 (2015) set them out. Class 1 gives motor help only while the rider pedals and stops at 20 mph; Class 2 may be driven by the motor alone and stops at 20 mph; Class 3 helps only while pedalling, stops at 28 mph and must have a speedometer, and under the same law no one under 16 may operate one and its riders must wear a helmet. Each state writes its own law, and the federal definition in 15 U.S.C. 2085 covers the product, not where it is ridden. How many states use the classes rests only on unofficial counts: PeopleForBikes, an industry trade group, said 36 in June 2021; GearJunkie, in a search summary, says 39; a driving-school blog says 36 plus the District of Columbia and reports Hawaii adopting the classes in July 2026. (E-bike classes and laws)

Clavicle (collarbone) fracture

A broken collarbone. Rooney, Sarriegui and Heron (BMJ Open Sport and Exercise Medicine, 2020), reviewing studies of adult road cyclists, found it the most common fracture, with the shoulder girdle the most common fracture site. A suspected injury needs medical care. (Injuries named)

Clunker

The stripped-down single-speed Schwinn bikes that Joe Breeze and Otis Guy began riding on Mount Tamalpais, Marin County, in 1973, according to the SFO Museum. California State Parks describes the early Marin bikes as old, heavy-framed, wide-tyred single-gear bikes with coaster brakes. (Mountain biking origins)

Cochrane review (helmets)

Thompson, Rivara and Thompson's Cochrane review, Helmets for preventing head and facial injuries in bicyclists, first published on 25 October 1999, with its literature search last updated in November 2006. From five case-control studies, and no randomised trials, it reported that helmets reduced the risk of head, brain and severe brain injury by 63 to 88 percent for cyclists of all ages. Like the later reviews, it measures injury among cyclists who crashed, not the chance of crashing; the size of the effect is disputed (see Elvik re-analysis). (Helmet evidence)

Commercial availability (UCI)

The UCI rule (Article 1.3.006, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide) that racing equipment must be of a type sold to anyone who rides as a sport. Commercially available means orderable through a direct, public order system, with an order confirmed within 30 days and delivery possible within a further 90. A prototype needs UCI authorisation, must go on sale within 12 months of its first use in competition, and may not be used on the track or for record attempts such as the Hour record. (UCI equipment rules)

Commissaire

A race official. UCI Part 1 (version on 1 July 2026), Article 1.1.010, requires commissaires to hold a licence, as riders and team staff do. Commissaires decide the 3 km rule independently (Part 2, Article 2.6.027, version on 1 July 2025) and, since the UCI's 2024 decision, may show yellow cards for offences that create a safety risk. (Licences and categories)

Concussion

A brain injury. The UCI's cycling-specific concussion protocol has applied to events on the UCI International Calendar from the 2021 season; under it a rider should not return to competition until at least one week after symptoms clear, or two weeks for juniors. AusCycling's guidelines of 26 June 2024 set a minimum of 21 days before returning to competition. British Cycling's March 2023 guidance is reported in a search summary to set 21 days too; that figure and its scope are unconfirmed. Each rule is written for its own setting; there is no single answer, and decisions about a rider belong with a doctor. A suspected injury needs medical care. (Concussion protocols)

Continental confederations

The five groupings of the UCI's member federations. The UCI's September 2025 Management Committee list names them as CAC (Africa), COPACI (Americas), ACC (Asia), UEC (Europe) and OCC (Oceania). (The UCI)

CPA

The professional riders' association. The UCI says the CPA supported the teams' request that led it to suspend the road disc brake trial in April 2016, and the CPA was one of the four parties to the March 2015 agreement on extreme weather. (Disc brakes in racing)

CPSC 16 CFR Part 1203

The mandatory US bicycle helmet standard of the Consumer Product Safety Commission, which applies to helmets made after 10 March 1999. The CPSC says it limits peak headform acceleration in impact tests to 300 g, after cold, hot and water-soaked conditioning, and adds a roll-off test, a strap strength test and a peripheral vision requirement. IIHS notes it drops helmets perpendicular to the surface and does not test at concussion-level forces. (Helmet standards)

CPSC 16 CFR Part 1512

The CPSC's regulation for bicycles as sold, covering assembly, braking, protrusions, structural integrity and reflectors: non-sidewalk bicycles generally need a colourless front reflector, a red rear reflector, pedal reflectors and wheel side reflectors. It also covers low-speed electric bicycles (motor under 750 watts, motor-only top speed under 20 mph) and exempts some competition track bicycles. Lighting for riding at night is a matter of state law. (Lights and visibility)

Cycling-for-all licence

A UCI licence for leisure cyclists that gives access only to events on the cycling-for-all calendar (UCI Part 1, version on 1 July 2026, Article 1.1.039). (Licences and categories)

Cyclo-cross

Off-road racing that alternates riding and carrying the bike over mixed terrain, on a bike like a road bike with wider, grippier tyres, as Cycling Canada describes it. UCI rules quoted by Cycling BC (2024) set a closed circuit of 2.5 to 3.5 km, at least 90 percent rideable, and tyres no wider than 33 mm without spikes or studs. The UCI dates the first cyclo-cross world championships to Charenton-le-Pont, near Paris, in 1950. (Cyclo-cross and gravel)

Cytech

A training and accreditation scheme for bicycle technicians, owned by the UK cycle industry through the Association of Cycle Traders. The ACT lists its levels as Theory One, Technical One (the minimum standard it says all mechanics should work towards), Technical Two and Technical Three. (Mechanics and bike fitting)

D

Derailleur

A gear-changing mechanism. The World of Sports Science entry on Encyclopedia.com credits Paul de Vivie with the first functional derailleur (single source, unconfirmed). VeloNews (2017) says the 1937 Tour de France was the first to permit derailleurs. The make used in 1937 is given two ways: Universalis says a three-speed Super Champion, VeloNews a Vittoria Super Champion. (The derailleur)

Di2

Shimano's name for its electronic shifting. BikeRadar (4 January 2023) describes the Dura-Ace R9200 version, launched in August 2021, as semi-wireless: the shifters talk to the rear derailleur wirelessly while the derailleurs stay wired to a battery in the frame. The UCI allows electronic derailleurs only if the rider alone controls them (commentary on Article 1.3.022, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide). (Groupsets and drivetrains)

Diamond frame

The traditional frame built around a main triangle that UCI Article 1.3.020 requires for road, track and cyclo-cross bikes; the clarification guide, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide, traces the rule to the Lugano Charter and says it aims to preserve the bicycle's culture and image and to prevent girder frames and extravagant shapes; the guide opens by citing the "primacy of man over machine". The Science Museum's 1885 Rover safety bicycle already has a diamond frame. (Frames and materials)

Disc brakes (road racing)

Brakes that use disc rotors. The UCI says it tested them in professional road racing from 2015, then suspended the trial in April 2016 after Francisco Ventoso was injured at Paris-Roubaix. Cycling BC reported that the UCI authorised them for road and BMX from 1 July 2018; Article 1.3.025, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide, now allows them in road, cyclo-cross, mountain bike, BMX and trials, and the guide says road rotors must be chamfered. (Disc brakes in racing)

Disc wheel

A solid wheel rather than a spoked one. Wikipedia (secondary) says time trial bikes may use them; on the track, UCI Article 1.3.018, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide, allows a front disc wheel only in events against the clock, so in the sprint it is allowed for the 200 m qualifying but not the matches. (Wheels and tyre sizes)

Disciplines (UCI)

The branches of the sport the UCI governs. Its 125th-anniversary release (April 2025) says it governed two in 1900, road and track, and 11 today, and names road, track, mountain bike, BMX Racing, BMX Freestyle, cyclo-cross, trials, indoor cycling, cycling esports and "gravel and snow bike" as one item, so the printed list has ten names against the 11 stated; the release does not say how it reaches 11. The UCI's 125th-anniversary article lists cycling esports (added in 2020), gravel (2022) and snow bike (2024) as separate additions, which suggests snow bike is counted on its own, but how the UCI counts its list is unconfirmed. Para-cycling is not listed as a separate item; it is run within road and track. (What cycling is)

Downhill (DHI)

An individual mountain bike race against the clock on a course usually 2 to 5 km long, elite runs lasting about 3 to 5 minutes, as the UCI defines it. Downhill was on the programme of the first UCI Mountain Bike World Championships at Durango, USA, in 1990. (Mountain biking)

Draisine (Laufmaschine)

The two-wheeled running machine that Karl Drais first rode on 12 June 1817 near Mannheim: the rider sat between the wheels, pushed along with the feet and steered the front wheel. The length of that first ride differs even within the City of Mannheim and Technoseum flyer: its German text gives about 7 km for the round trip, its English summary says he turned after a little under 5 miles. Britannica and VeloNews (2017), seen only in search summaries and unconfirmed, give 14 km and a round trip of about 13 km. Mannheim banned the machine from its pavements in December 1817, and the flyer says copies built in England, some partly of iron, were nicknamed hobby horses. (The draisine and the velocipede)

Dutch reach

Opening a car door with the hand on the far side from it, which amended Highway Code Rule 239 recommends to reduce the risk of hitting passing cyclists, motorcyclists and pedestrians. The same rule says drivers and passengers MUST ensure they do not hit anyone when opening a door. (Road rules for cyclists)

E

EAPC

An electrically assisted pedal cycle under the law of Great Britain: pedals that can propel it, a motor of no more than 250 watts continuous rated power, assistance that cuts off at 15.5 mph, and markings showing the maker and motor output plus battery voltage or top speed, as the UK government's information sheet (updated 10 December 2024) sets out. It may be ridden by anyone aged 14 or over. For Northern Ireland, nidirect gives the same definition and age and says no licence, registration, tax or insurance is needed; Greater Manchester Fire and Rescue Service says the same of licence, tax and insurance. An e-bike that does not meet these rules is treated as a motor vehicle. (E-bike classes and laws)

Elimination race

A track race in which the last rider at each intermediate sprint is eliminated (UCI Part 3, version applying 1 January 2026, Article 3.2.218, as reproduced by the Japan Cycling Federation). It is one of the four races of the omnium. (Track cycling)

Elvik re-analysis

Rune Elvik's 2011 re-analysis of the 2001 helmet meta-analysis by Attewell, Glase and McFadden. Elvik concluded the earlier work was affected by publication bias and time-trend bias and overstated helmet benefits; a 2013 corrigendum corrected data and analysis errors and kept that conclusion (both read from summaries of the papers). On the other side, the 2023 review of meta-analyses by Buth, Barbour and Abdel-Aty left it out, saying Olivier and Creighton (2017) had examined those studies in more detail, and reports that Olivier and Creighton found no strong evidence of publication bias and that Olivier and Radun (2017) argued helmet effectiveness is not overstated. It is part of the dispute over the size of the helmet effect. (Helmet evidence)

E-mountain bike cross-country (E-XC)

Cross-country racing on electrically assisted mountain bikes. The UCI says its first world titles were awarded in 2019 at Mont-Sainte-Anne, Canada. UCI Part 1 (version on 1 July 2026), Article 1.1.035, says riders in events using electrically power assisted cycles must be 19 or over. (Mountain biking)

EN 1078

The European standard for helmets for pedal cyclists and for users of skateboards and roller skates. BSI lists EN 1078:2012+A1:2012 as current but under review; it superseded EN 1078:1997 and covers construction including field of vision, shock absorption, retention systems and marking. Escape Collective reported on 17 February 2025 that a coming European standard built on EN 17950 would make rotational testing mandatory and replace EN 1078, with no in-force date set; a claimed 2025 edition is unconfirmed. (Helmet standards)

EN 15194

The European standard for electrically power assisted cycles (EPACs) meant for public roads, with a maximum continuous rated power of 0.25 kW and assistance cut at 25 km/h or when the rider stops pedalling. Standards catalogues list the 2017 edition as withdrawn in 2023 and replaced by EN 15194:2017+A1:2023, but give different dates: 1 September 2023 (the Estonian standards body's own listing, which reads 'Withdrawn from 01.09.2023'; the Albanian body's listing, seen only in a search summary, gives the same date) and 23 August 2023 (another catalogue, seen only in a search summary). The UCI bases its own e-bike rules on EN 15194, with the UCI's rules prevailing where they conflict (Article 1.3.010 bis, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide). (E-bike classes and laws)

EN 17950

EN 17950:2024, a European test method for helmets that measures translational and rotational kinematics in shock-absorption tests. It is a test method, not a complete helmet product standard; Escape Collective reported in February 2025 that a coming product standard would be built on it, with pass-fail thresholds still to be agreed. (Helmet standards)

Enduro

A mountain bike format of several timed special stages, mainly downhill, joined by untimed liaison stages, as the UCI describes it; E-enduro uses the same idea for enduro e-bikes on courses with technical climbs. The UCI says enduro, E-enduro and cross-country marathon joined its Mountain Bike World Cup from 2023. (Mountain biking)

EPAC

Electrically power assisted cycle, the term used in EN 15194 and the UCI rules. For UCI events the clarification guide, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide, limits assistance (Article 1.3.010 bis) to 25 km/h, unless an event's technical guide says otherwise where EN 15194 does not apply, and to forward pedalling, requires it to cut out within two metres of the rider stopping pedalling, caps the drive unit at 3.1 kg and the battery at 4.5 kg, and requires the battery to conform to UN3480. (E-bike classes and laws)

E-scooter (UK)

Greater Manchester Fire and Rescue Service says privately owned e-scooters cannot legally be used on public roads or spaces because they are motor vehicles that cannot currently be insured, while rental e-scooters in official trials may be ridden by people aged 16 or over with the right licence. The Department for Transport recorded 10 e-scooter riders killed in Great Britain in 2025 (factsheet published 30 July 2026). (E-bike and e-scooter safety)

Extreme Weather Protocol

The UCI's procedure for professional road races in adverse weather. The UCI says the riders', teams' and organisers' associations agreed with it on 20 March 2015 that an action plan was needed, and that the protocol was introduced in 2015; the titles of 2015 UCI articles, seen only in search results, say it was to be tested at that year's Giro d'Italia and Criterium du Dauphine. Inner Ring, in a search summary, describes it as a regulation new for the 2016 season; which date the rulebook gives is unconfirmed. (Heat and extreme weather)

F

Fairing

UCI Article 1.3.024, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide, prohibits any device added to or blended into the structure to reduce air resistance or artificially accelerate propulsion, such as a protective screen or fairing. Ahmed, Qureshi and Khan (2014) say the UCI banned aerodynamic fairings as early as 1914; that date rests on their paper alone. (UCI equipment rules)

FARS

The Fatality Analysis Reporting System, the source of NHTSA's counts of road deaths in the United States. It includes a crash only if it involves a motor vehicle on a public trafficway and someone dies within 30 days; NHTSA's injury numbers are estimates from a separate sampling system (CRSS). NHTSA's fact sheet of July 2026 gives 1,103 pedalcyclist deaths in 2024, from its annual report file; NHTSA replaces each annual file with a final file a year later, which can change the count. (What the casualty figures show)

Feed zone

The UCI said in about January 2025 that from 2025 road race organisers must provide a feed zone roughly every 30 to 40 km, with litter zones, ending the open feeding allowed during Covid-19. In cyclo-cross, UCI Article 5.1.062, as quoted by Cycling BC (2024), does not allow food or drink to be handed out at all. (Race safety and the UCI)

FIAC and FICP

The amateur (FIAC) and professional (FICP) federations that the IOC made cycling split into in 1965, leaving the UCI as a liaison office, according to the UCI. The UCI says Hein Verbruggen reunited the two branches in 1993; Wikipedia (secondary, search summary) gives 1992. (The UCI and the governing bodies)

Fixed gear

Under UCI Article 1.3.025, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide, track bikes may not have a freewheel, multiple gears or brakes in competition or training, and drive through a single chain, chainring and sprocket; a fixed gear is prohibited on road and cyclo-cross bikes in competition. (Bike types)

Flamme rouge

The common name for the red triangle that marks the last kilometre of a road race. UCI Part 2 (version on 1 July 2025), Article 2.3.005, requires the red triangle; the name itself is not in the rule. (Road races explained)

Flying lap

A track race against the clock with a flying start from the finish line (UCI Part 3, version applying 1 January 2026, Article 3.2.258, as reproduced by the Japan Cycling Federation). (Track cycling)

Fork and stay width rule

UCI Article 1.3.017, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide: the inside width between the fork legs may not exceed 11.5 cm and between the sides of the rear triangle 14.5 cm. The UCI set these widths from 1 January 2026 for road and from 1 January 2027 for track. (Handlebars, wheels and the 2026 changes)

Frameset approval (UCI)

The UCI's scheme for approving frames and forks for its races, which it says began in 2011, followed by wheel approval in 2015. Since 2019 frames submitted for approval must come with certification to the ISO 4210 safety standard (as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide), and approved framesets carry a UCI sticker. The UCI says there is no restriction on riding a bike without the sticker; it only qualifies a frameset for UCI-sanctioned competition. (UCI equipment rules)

G

Gear-ratio cap (54 x 11)

A maximum gear the UCI announced it would test, described as 10.46 metres per crank revolution, in a stage race in the second half of the 2025 season. BikeRadar (1 January 2026) reported that SRAM complained to the Belgian Competition Authority; after that authority's decision of 9 October 2025 the test was suspended. The UCI said after its 2 to 4 June 2026 meeting that the Brussels Court of Appeal had dismissed its appeal, that the protocol remains suspended and that it will go to the Belgian Court of Cassation. No UCI gear limit applies now. (Handlebars, wheels and the 2026 changes)

General classification

The overall standings of a stage race, made by adding each rider's times. UCI Part 2 (version on 1 July 2025) makes the individual general classification on time compulsory in the main stage races (Article 2.6.013) and breaks ties first by adding back fractions of a second from individual time trials, then by summed stage placings, then by the last stage placing (Article 2.6.015). (Stage races and jerseys)

Giro d'Italia

The Italian Grand Tour. Il Foglio (13 May 2024) says La Gazzetta dello Sport announced it on 24 August 1908 and that the first edition left Milan on 13 May 1909; that race was decided on points, not time, and won by Luigi Ganna. Wikipedia (secondary, search summary) says the pink leader's jersey was introduced in 1931. (How the Grand Tours began)

Go-Ride

British Cycling's youth programme, run through registered clubs that offer coaching and racing in several disciplines, as search summaries of British Cycling pages (some dated 2013) describe it. British Cycling's pages refused our requests, so the description is unconfirmed. (Training and courses)

Grand Tour

The collective name for the Tour de France, the Giro d'Italia and the Vuelta a Espana. UCI Part 2 (version on 1 July 2025) says a Grand Tour must last 15 to 23 days (Article 2.6.007), may cover at most 3,500 km (Article 2.6.011) and must have two rest days (Article 2.6.012), and that WorldTour teams start with 8 riders in Grand Tours (Article 2.2.003). (Stage races and jerseys)

Gravel

A UCI discipline since 2022, the year of the first UCI Gravel World Championships, held in the Veneto, Italy, on 8 and 9 October 2022 on a course the UCI described as about three-quarters gravel and cobbled sections. The UCI's route release did not define gravel or set a bike rule; the UCI Gravel World Series said in March 2023 that only drop-handlebar bikes are accepted at the World Championships. (Cyclo-cross and gravel)

Gravel bike

A drop-handlebar bike for unpaved roads that Wikipedia (secondary) describes as typically having tyres around 40 mm wide, nearly always disc brakes, mostly tubeless tyres, geometry between a road bike and a cross-country mountain bike, and lower gearing than a road bike. (Bike types)

Green jersey

The points classification jersey of the Tour de France, which the ASO-linked L'Etape series dates to 1953. The Vuelta a Espana's points jersey is also green (Wikipedia, secondary). (Stage races and jerseys)

Groupset

A maker's matched set of drivetrain and braking components: shifters, derailleurs, crankset, cassette, chain and brakes. Examples in our research are Shimano Dura-Ace R9200, SRAM RED AXS and Campagnolo Super Record 13, which BikeRadar (4 June 2025) reported as a wireless 2x13-speed road group. Weight and performance figures for each are the makers' claims. (Groupsets and drivetrains)

H

Half-stage

Two stages run on the same day. UCI Part 2 (version on 1 July 2025), Article 2.6.010, forbids half-stages in the UCI WorldTour, and Article 2.6.019 gives smaller finish bonuses (6, 4 and 2 seconds) where they are held. (Stage races and jerseys)

Handlebar neuropathy

Compression of the ulnar or median nerve in the hand from long pressure on the handlebar, which Thompson and Rivara (American Family Physician, 2001) describe; ulnar neuropathy brings numbness and tingling in the ring and little fingers and weakness of finger movements. A suspected injury or condition needs medical care. (Injuries named)

Handlebar width rule (Article 1.3.022)

The UCI limits on handlebars and brake levers. For road and cyclo-cross from 1 January 2026 the UCI Management Committee (22 to 24 September 2025) confirmed a 400 mm minimum width, a 65 mm maximum flare and a 280 mm minimum between the brake hoods, and asked for the 280 mm figure to be reviewed during 2026 (Article 1.3.022, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide); track limits (350 mm width, 80 mm flare) follow from 1 January 2027. An undated UCI statement had given 320 mm between the levers; the September 2025 decision and the clarification guide give 280 mm. (Handlebars, wheels and the 2026 changes)

Hardtail and full suspension

Two kinds of mountain bike: a hardtail has no rear shock (with a suspension or rigid fork), while a full-suspension bike has suspension front and rear, as Bike Perfect (updated 23 September 2022) describes them. Bike Perfect gives typical rear travel from up to about 120 mm for cross-country bikes to around 200 mm for downhill bikes. (Bike types)

Harrogate consensus

The expert agreement behind the UCI's concussion protocol, from a UCI-convened meeting in Harrogate in September 2019, published by Swart and colleagues in June 2021. It describes a six-stage graded return, a minimum of one week from injury to competition (two weeks' recovery for juniors), and immediate, permanent removal from competition for riders with specified red-flag features. Its authors say it is not a clinical practice guideline or a legal standard. A suspected injury needs medical care. (Concussion protocols)

Hell of the North

The nickname of Paris-Roubaix, which the UCI says came after the First World War left the route damaged. The race was first held in 1896 and won by Josef Fischer, and the UCI says the association Les Amis de Paris-Roubaix was formed in 1983 to protect its cobbled sectors. (The first races)

Helmet laws

Laws requiring cyclists to wear helmets. The US CDC's MMWR reported that Victoria, Australia, brought in the first statewide law for all cyclists from 1 July 1990. GHSA (March 2024, search summary) says no US state requires helmets for all riders, while 21 states, DC and the Northern Mariana Islands have laws for riders under a certain age. Whether laws help is disputed: Dennis and colleagues (BMJ, 2013) found no independent effect of Canadian provincial laws on head injury admissions, and Cycling UK (June 2019) opposes compulsion, while a 2018 meta-analysis by Hoye, seen only in a search summary, found laws reduced head injuries among cyclists who crashed. (The helmet law debate)

Helmet rule (UCI Article 1.3.031)

UCI Article 1.3.031, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide, makes a rigid safety helmet mandatory in competition and official training in all disciplines except indoor cycling and BMX freestyle flatland, approved to an official safety standard, correctly adjusted and unaltered. From 1 January 2026 for road and cyclo-cross (1 January 2027 for track), mass-start helmets must be traditional helmets with at least three air inlets, no ear covering and no visor; time trial helmets are allowed only in road individual and team time trials and in the track individual pursuit, team pursuit, kilometre time trial and team sprint. An undated UCI statement said a UCI helmet certification protocol would apply no earlier than 1 January 2027; no later UCI page confirming it was found, so its status is unconfirmed. (Helmet rules in racing)

Herzog law

France's first anti-doping law, passed in 1965. Larousse says it penalised only riders who tested positive at a race finish, and that the first anti-doping control at the Tour de France followed in 1966. (Doping and official decisions)

Hierarchy of road users

A concept added to the Highway Code from 29 January 2022 in Rules H1 to H3, which places the road users most at risk in a collision at the top. Rule H1 says those driving vehicles that can cause the greatest harm bear the greatest responsibility to reduce the danger they pose, while every road user keeps a duty to behave responsibly; cyclists have a responsibility to reduce danger to pedestrians. Rule H2 says drivers MUST give way to pedestrians on a zebra crossing and to pedestrians and cyclists on a parallel crossing. It applies in England, Scotland and Wales. (Road rules for cyclists)

High Temperature Protocol

A UCI protocol for road races in heat, approved by the Management Committee in early 2024, which assesses conditions from temperature and relative humidity at real-time weather stations; measures range from shade at the start and extra drinks to changing the start time and neutralising sections. Press descriptions give its bands by wet bulb globe temperature (WBGT), with red at 28 C and above; the UCI release names no thresholds, so those figures are unconfirmed. (Heat and extreme weather)

High wheeler (ordinary, penny-farthing)

The bicycle with a large front wheel driven directly by the pedals, which the Coventry Transport Museum says was meant to cover more ground per pedal turn; the museum gives its three names as penny-farthing, high-wheeler and ordinary bicycle, and shows an 1871 Starley and Hillman Ariel. (The safety bicycle and the pneumatic tyre)

Highway Code

The UK's rules for road users. GOV.UK says rules worded MUST or MUST NOT are legal requirements whose breach is an offence, while "should" rules are guidance that can be used in evidence to establish liability. The Great Britain Code applies in England, Scotland and Wales; its 2022 changes took effect on 29 January 2022, and Northern Ireland has its own Code. (Road rules for cyclists)

Hookless rim

The word Schwalbe, a tyre maker, uses for straight-side rims, which ISO 5775-2 distinguishes from hooked bead and crotchet rims. Schwalbe says that under ETRTO rules hookless road rims have a 5 bar maximum pressure, yet the same page gives a table allowing 5.5 bar for 18 to 24 mm tyres. ETRTO's own document was not opened, so the figure is unconfirmed, and these are one maker's statements. (Wheels and tyre sizes)

Hour record

The record for distance covered on a track in one hour. The UCI lists Filippo Ganna's 56.792 km at Grenchen, Switzerland, on 8 October 2022 as the men's record and Vittoria Bussi's 50.455 km at Aguascalientes, Mexico, on 10 May 2025 as the women's. Since 15 May 2014 attempts may use any bike that meets the UCI's endurance track rules (road.cc). Lists before 2014 rest on Bikeraceinfo, a results site, not the UCI. (The Hour record)

I

IBMXF

The International BMX Federation, founded in 1981; Olympedia and the UCI say it held the first BMX World Championships at Dayton, Ohio, in 1982. When BMX joined the UCI is given two ways: the UCI says 1985, with its first world championships in Italy, while Olympedia says the UCI's amateur arm held BMX championships from 1985 and absorbed the IBMXF in 1993. The World of Sports Science entry on Encyclopedia.com dates the first BMX world championships to 1993, and a search summary of EcuRed places the 1982 championships in California (unconfirmed). (BMX origins)

ICA

The International Cycling Association, founded in 1892 by British cycling bodies. The UCI says continental federations walked out of an ICA congress in Paris on 14 April 1900 and founded the UCI, and that Britain's joining the UCI in 1903 ended the ICA. (The UCI and the governing bodies)

If in doubt, sit them out

The strapline of the UK's grassroots concussion guidelines, first published by the UK Government and the Sport and Recreation Alliance in April 2023 and updated in November 2024, which say no one should return to sport within 24 hours of a suspected concussion. AusCycling (June 2024) adopts guidelines under the same phrase, and British Cycling's March 2023 guidance, seen only in a search summary, used it too. A suspected injury needs medical care. (Concussion protocols)

Individual pursuit

A track race in which two riders start on opposite sides of the track over a fixed distance, the winner catching the other or setting the faster time (UCI Part 3, version applying 1 January 2026, Article 3.2.051, as reproduced by the Japan Cycling Federation). Since 1 January 2025 it is 4 km for both elite men and elite women and 3 km for juniors (Article 3.2.052). (Track cycling)

Indoor cycling (artistic cycling and cycle-ball)

The UCI discipline made up of artistic cycling and cycle-ball. At the 2025 UCI Indoor Cycling World Championships in Goppingen, Germany (7 to 9 November 2025), two titles were in cycle-ball (men and women) and five in artistic cycling (single women, single men, pairs women, pairs mixed and Act-4 teams of four); no official UCI definition of cycle-ball was found. The UCI dates its first indoor world championships to Leipzig in 1930, while the World of Sports Science entry on Encyclopedia.com gives 1956. (BMX, trials and indoor)

ISO 4210

The international safety standard for bicycles. The UCI says that since 2019 frames submitted for its approval must come with certification to ISO 4210, and its wheels must pass the impact test of ISO 4210-2:2023 (as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide). (Frames and materials)

ISO 5775 (ETRTO sizing)

The international system for bicycle tyre and rim sizes. BSI lists ISO 5775-1:2023 for tyre designations and ISO 5775-2:2021 for rims. Wikipedia (secondary) says the system was developed by the European Tyre and Rim Technical Organisation (ETRTO) and labels tyres by width and bead seat diameter in millimetres, so a 622 mm bead seat matches 700C and 584 mm matches 650B. (Wheels and tyre sizes)

J

Jersey pocket rule (UCI)

A UCI Management Committee decision of 2 to 4 June 2026 that bans front pockets on racing jerseys from 1 July 2026, except one pocket used only for a radio. (Clothing)

K

Keirin

A track race in which riders follow a motorised pacer, which leaves the track with three laps to go on a 250 m track, before sprinting for the line (UCI Part 3, version applying 1 January 2026, Article 3.2.134, as reproduced by the Japan Cycling Federation). The UCI says the keirin joined the Olympic programme at Sydney 2000 and the women's keirin at London 2012. (Track cycling)

Killed or seriously injured (KSI)

The Department for Transport's combined count of people killed or seriously injured on the roads. Its pedal cycle factsheet (30 July 2026) gives 79 cyclists killed and 4,311 seriously injured (adjusted) in Great Britain in 2025. The figures come from police reports and undercount; the adjusted series is re-estimated every year, so the 2024 serious-injury figure was 3,822 in the 2024 factsheet (25 September 2025) and 3,753 in the 2025 factsheet. Deaths are revised too: the DfT's provisional 2025 estimate, as Road Safety GB reported it on 28 May 2026, gave 81 cyclist deaths against 79 in the final factsheet. (What the casualty figures show)

Kilometre time trial

An individual standing-start track time trial. Since 1 January 2025 it is run over 1,000 m for both men and women at World Cup and World Championship level (UCI Part 3, version applying 1 January 2026, as reproduced by the Japan Cycling Federation). (Track cycling)

L

League Cycling Instructor (LCI)

An instructor certified by the League of American Bicyclists, an advocacy non-profit, to teach its Smart Cycling curriculum. The League says candidates must first pass its Smart Cycling Complete Course with 85 percent or higher, then attend a seminar of about 24 hours (2025). (Training and courses)

Licence (UCI)

The identity document that lets a rider, team staff member or official take part in events under the UCI and its member federations (UCI Part 1, version on 1 July 2026, Articles 1.1.001 and 1.1.002). A licence is valid for one calendar year, may come from only one national federation, and gives its holder a permanent UCI ID (Articles 1.1.008, 1.1.009 and 1.1.009 bis). (Licences and categories)

Lights (Highway Code Rule 60)

Highway Code Rule 60 for Great Britain says that at night a cycle MUST have a white front light and a red rear light lit, a red rear reflector, and amber pedal reflectors if made after 1 October 1985. Northern Ireland's Code gives 24 January 1996 for pedal reflectors, citing different regulations; each text is right for its own area. (Lights and visibility)

Lithium-ion battery fire

Fires involving the lithium-ion batteries of e-bikes and e-scooters, which fire services and regulators track. London Fire Brigade reported on 28 January 2026 a record 206 e-bike and e-scooter fires in London in 2025 and links them to battery failure, conversion kits, chargers and products that do not meet UK standards; FDNY reports 18 such deaths in New York City in 2023, 6 in 2024 and 1 in 2025 up to its December 2025 release. In the US a CPSC battery standard was still a proposal on 22 October 2026. Fire services' own advice is the authority; none is reproduced here. (E-bike batteries and fire safety)

Low-speed electric bicycle (US federal)

The US federal product definition in 15 U.S.C. 2085, added by Public Law 107-319 in December 2002: a two- or three-wheeled vehicle with fully operable pedals and an electric motor of less than 750 watts whose motor-only top speed, with a 170-pound rider on level ground, is under 20 mph. The law makes such bikes consumer products under the CPSC; it defines the product, and the rules on where they are ridden come from state law. (E-bike classes and laws)

M

Macmillan claim

The claim, found in popular histories and, according to the historian Nicholas Oddy, presented by the National Museum, that the Dumfriesshire blacksmith Kirkpatrick Macmillan built a lever-driven rear-wheel bicycle about 1839. It is contested: Oddy (Cycle History 33, 2024) argues that the claim that Macmillan invented the bicycle is fundamentally mistaken, because the bicycle developed after 1860. (The draisine and the velocipede)

Madison

A track race for teams of two riders, placed by points won in sprints and by taking laps (UCI Part 3, version applying 1 January 2026, as reproduced by the Japan Cycling Federation). The UCI says the men's Madison joined the Olympic programme at Sydney 2000, that it added the women's Madison to the track programme in 2017, and that the women's Olympic Madison followed at the Tokyo Games. (Track cycling)

Maglia rosa

The pink jersey of the Giro d'Italia's overall leader. Wikipedia (secondary, search summary) says it was introduced in 1931, its colour taken from La Gazzetta dello Sport's pink pages. Wikipedia lists the Giro's other jerseys as the maglia ciclamino (points, brought back in 2017), the maglia azzurra (mountains) and the maglia bianca (best young rider, under 25). (Stage races and jerseys)

Masters (MO and WM)

UCI categories for riders aged 30 and over who choose that status; it is closed to riders on UCI-registered teams and limits them to masters events. UCI Part 1 (version on 1 July 2026), Article 1.1.036, now names the men's category MO, Men Open, covering men masters and all riders not eligible for women masters events; Article 1.1.037 sets women masters (WM). (Licences and categories)

Minimum weight (6.8 kg)

UCI Article 1.3.019, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide, says a bicycle may not weigh less than 6.8 kg. It is weighed in working order without removable items such as bottles and bike computers, while bottle cages and clipped-on extensions stay on. road.cc (1 June 2026) says the limit was introduced in 2000; it has not been changed. (UCI equipment rules)

MIPS and rotational-impact systems

Helmet makers' technologies aimed at rotational forces; any protective benefit they state is the maker's claim, and none is a regulatory standard. IIHS (26 June 2018) described MIPS (Multi-directional Impact Protection System) as a low-friction layer that lets the head slide relative to the helmet. In independent lab tests, Bland and colleagues (2019) found MIPS-equipped helmets scored better on Virginia Tech's STAR measure than helmets without it. Escape Collective (2025) also names WaveCel and Kask's own WG11 protocol. (Independent helmet tests)

Monuments

Five one-day road races grouped under this name: Milan-San Remo, the Tour of Flanders, Paris-Roubaix, Liege-Bastogne-Liege and Il Lombardia. All five men's races of 2026 are finished, the last being Il Lombardia on 10 October 2026; Wikipedia (secondary) shows no women's Il Lombardia on the 2026 Women's WorldTour calendar. (The Monuments)

Motor-pacing

A track race in which each rider rides behind a pacer on a motorcycle (UCI Part 3, version applying 1 January 2026, as reproduced by the Japan Cycling Federation). (Track cycling)

Mountain bike (discipline)

Off-road racing that the UCI added as a discipline in 1990, the year of the first UCI Mountain Bike World Championships at Durango, USA, with cross-country and downhill; the UCI says cross-country has been Olympic since Atlanta 1996. Collectors Weekly says the company MountainBikes, founded by Gary Fisher and Charlie Kelly in Fairfax, California, in 1979, gave the bikes their generic name. (Mountain biking)

N

National federation

A country's cycling governing body and UCI member, which issues licences on criteria it sets (UCI Part 1, version on 1 July 2026, Article 1.1.006). The UCI said in September 2025 that it had 206 affiliated national federations, its own figure. (National federations)

National Standard for Cycle Training

The Department for Transport's statement of competent cycling and cycling instruction (June 2018), in six roles from preparing for a journey to delivering cycle training. It says it is a guide, not a mandatory prerequisite for cycling, and is the basis for Bikeability, whose delivery guidance is a separate document. (Training and courses)

Novice (USA Cycling)

The entry category for every discipline in USA Cycling racing, introduced in its 2020 membership guide to replace Category 5 (road, track, cyclo-cross) and Category 3 (mountain bike). From 1 January 2025 a rider needs at least five races to leave Novice in any discipline except track, and under Policy VIII (revised 7 July 2026) a rider may ask to be downgraded but never back to Novice. (Licences and categories)

O

Omnium

A one-day track event of four races in this order: scratch race, tempo race, elimination race and points race (UCI Part 3, version applying 1 January 2026, Article 3.2.247, text modified 1 January 2025, as reproduced by the Japan Cycling Federation). (Track cycling)

Onboard devices (Article 1.3.006 bis)

Devices carried on the bike or rider in UCI races. Article 1.3.006 bis (introduced 10 June 2021), as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide, allows devices recording position, images and mechanical data such as power, speed and cadence, and the heart rate, body temperature and sweat rate of the rider (viewable only by the rider in competition), but bars devices measuring metabolic values such as glucose or lactate. (UCI equipment rules)

OPSS

The UK's Office for Product Safety and Standards. On 12 December 2024 it launched statutory guidelines for businesses on lithium-ion battery safety for e-bikes, which say batteries must have a safety mechanism against thermal runaway to be considered safe under the General Product Safety Regulations 2005. On 27 February 2025 it repeated its warning about UPP U004 and U004-1 e-bike batteries. (E-bike batteries and fire safety)

Oval chainring

The UCI clarification guide, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide, allows oval chainrings provided the pedals still travel in a circular path (commentary on Article 1.3.010). (Groupsets and drivetrains)

P

Para-cycling

Cycling for athletes with impairments. Cycling Canada says it became Paralympic at Seoul 1988 and is raced on road and track in four cycle categories: bicycle, tricycle, handcycle and tandem. Cycling New Zealand describes the sport classes as B (tandem), C1 to C5 (bicycle), H1 to H5 (handcycle) and T1 and T2 (tricycle), C1 and T1 being the greater impairments in their classes. Handcycle positions are given two ways: Cycling New Zealand says H1 and H2 ride reclined and H3 to H5 kneeling or seated, while a 2015 British Cycling page, seen only in a search summary, said H1 to H4 lie and H5 kneels. (Para-cycling)

Paris-Brest-Paris

A long-distance event first run on 6 September 1891 and won by Charles Terront in slightly under 72 hours, according to Bill Bryant of Randonneurs USA. Its professional race ended after 1951; the Audax Club Parisien has run a non-competitive randonneur (brevet) event alongside it since 1931 and now holds it every four years, with the next edition listed for August 2027. (The first races)

Paris-Roubaix Femmes

The women's Paris-Roubaix, first held on 2 October 2021 from Denain with 129 riders, the first time women raced the race's cobbles; the UCI says Lizzie Deignan won alone after 82 km solo. (Women's racing history)

Paris-Rouen

The race of 7 November 1869 that the UCI calls the first city-to-city race, won by James Moore. Its length and time differ by source: the UCI gives 123 km in 10 hours 25 minutes, Grace's Guide gives both about 113 km and about 130 km, and the Encyclopedia of Modern Europe says about 80 miles in roughly ten and a half hours. (The first races)

PAS (Power Assist System)

Yamaha's electrically power-assisted bicycle, which matched motor assistance to the rider's pedalling force. Yamaha's history says it began development in April 1988, approached Japanese regulators in August 1990, unveiled the PAS on 27 July 1993 and began limited sales on 1 November 1993. A search summary of another Yamaha page reads as 27 July 1990 for the unveiling, which appears to confuse it with the 1990 approach to regulators; that reading is unconfirmed. (The e-bike)

Passing distance

How much room a driver leaves when overtaking a cyclist. Highway Code Rule 163, amended in 2022, gives at least 1.5 metres at speeds up to 30 mph as a guide; it is worded "should", so it is guidance, not law. The same changes let drivers cross a double white line, if the road is clear, to pass a cyclist or horse rider going at 10 mph or less (Rule 129). In the US, passing laws are state law: California's Three Feet for Safety Act has applied since 16 September 2014, and counts of states differ by source and date: NCSL gives 35 states and DC with a 3-foot minimum (as of September 2021), an NCSL brief of 2018 counted 32, and League of American Bicyclists pages give 38 states and DC (search summary) or 24 states and DC (undated) with a defined distance. (Road rules and close passing)

Patellofemoral pain syndrome

A knee condition that Rooney, Sarriegui and Heron (2020) found the most common overuse diagnosis in road cyclists, whose overuse injuries most often affect the knee; iliotibial band syndrome and rotator cuff tendinopathy came next. A suspected injury or condition needs medical care. (Injuries named)

Pedalcyclist (NHTSA)

The term NHTSA uses for cyclists in US crash statistics. Up to 2021 it counted only riders of cycles powered solely by pedals; from 2022 it includes riders of bicycles powered by pedals, motors or both, so counts from 2022 are not directly comparable with earlier years (NHTSA, July 2026). (What the casualty figures show)

Pneumatic tyre

Who invented the pneumatic tyre is disputed: Grace's Guide calls Robert William Thomson its inventor, with a patent of 1845, and says John Boyd Dunlop's patent of 1888 was later ruled invalid because Thomson's came first, while a vintage-bicycle seller's history page (an operator statement) says Dunlop is widely credited with the first practical pneumatic tyre for cycles. Wikipedia, seen only in a search summary and unconfirmed, says that on 18 May 1889 Willie Hume won all four cycling events at a Belfast sports meeting on pneumatic tyres. (The safety bicycle and the pneumatic tyre)

Points race

A track race placed by points won in intermediate sprints and by taking laps (UCI Part 3, version applying 1 January 2026, Article 3.2.114, as reproduced by the Japan Cycling Federation). Sprints pay 5, 3, 2 and 1 points, doubled at the final sprint, and a rider gains 20 points for lapping the field or loses 20 for being lapped (Articles 3.2.118 and 3.2.119). The UCI says the 1984 Los Angeles Games made it a permanent Olympic event. (Track cycling)

Polka-dot jersey

The mountains jersey of the Tour de France, red dots on white, which the ASO-linked L'Etape series dates to 1975. The Vuelta a Espana's mountains jersey has been white with blue dots since 2010 (Wikipedia, secondary). (Stage races and jerseys)

Price limits (track equipment)

Maximum prices the UCI Management Committee (22 to 24 September 2025) set for track framesets, forks, wheels, handlebars, helmets and skinsuits for the Los Angeles 2028 Olympic cycle, from 1 January 2027. This site does not give the amounts. (UCI equipment rules)

Professional Cycling Council (PCC)

The UCI body that sets the UCI WorldTour and UCI Women's WorldTour calendars and proposes them to the UCI Management Committee for approval (UCI Part 2, version on 1 July 2025, Article 2.1.001); it also sets the distance of men's WorldTour one-day races (Article 2.3.002). (Rankings and the WorldTour)

Prologue

An individual time trial within a stage race. UCI Part 2 (version on 1 July 2025), Article 2.6.006, limits it to 8 km (under 4 km in elite women's and junior races) and says it counts towards the general classification and as a race day. (Stage races and jerseys)

R

Rainbow jersey

The jersey of a UCI world champion. The UCI says elite gravel world champions receive it while age-group winners get a separate jersey (2022), and after the 2026 cyclo-cross worlds it counted 12 rainbow jerseys for Mathieu van der Poel across disciplines. (Road World Championships)

Recall

A regulator's action over an unsafe bike, part or battery, recorded in each regulator's own database. The research samples the CPSC (United States), the OPSS (United Kingdom) and Health Canada; CPSC recall 25-177 (13 March 2025), for example, directs owners to stop using the affected bike and contact an authorised dealer for the remedy. (Recalls)

Red jersey (Vuelta)

The overall leader's jersey of the Vuelta a Espana since the 2010 edition; Wikipedia (secondary) says it was earlier yellow, then gold, while Ara (26 August 2025) says the leader of the first Vuelta, in 1935, wore orange, the colour of the organising newspaper. (Stage races and jerseys)

Regulation (EU) No 168/2013

The EU type-approval regulation for two- and three-wheel vehicles. Article 2(2)(h) excludes pedal cycles whose auxiliary motor has a maximum continuous rated power of 250 W or less, with output cut when the rider stops pedalling and reduced and cut off before 25 km/h. (E-bike classes and laws)

Relative energy deficiency in sport (REDs)

A condition caused by chronic under-fuelling, as the UCI and World Athletics describe it; in 2025 they named it the subject of their second planned joint e-learning module. A suspected injury or condition needs medical care. (Injuries named)

Repack

A downhill time trial on Cascade Canyon Road near Fairfax, Marin County, first raced on 21 October 1976 and won by Alan Bonds; the name came from having to repack the coaster-brake hubs with grease after each run. Collectors Weekly and the SFO Museum say 22 races were held from 1976 to 1979. Gary Fisher holds the course record, so accounts naming him as Repack's fastest rider and Bonds as winner of the first race describe different things. (Mountain biking origins)

Restart Protocol

A SafeR procedure, described by the UCI in about July 2025, for road races interrupted by extreme weather or safety problems, with a maximum stoppage of 15 minutes and rules on restart decisions, time gaps and communication. (Race safety and the UCI)

Risk compensation

The idea that helmet wearers take more risks. Buth and colleagues (2023) say their review does not address it and point to a separate review that found little or no support for it; they report that Olivier and Creighton (2017) adjusted for it with nearly identical results and that Hoye (2018) found it unclear whether helmet wearing has positive or negative behavioural effects. Cycling UK's 2019 briefing cites evidence that drivers pass helmeted cyclists more closely. (Helmet evidence)

Road rash

The common name for abrasions from sliding along a road surface; Thompson and Rivara (2001) note that embedded debris can leave permanent skin marks, called traumatic tattooing. A suspected injury needs medical care. (Injuries named)

Rule 59 (Highway Code)

The Highway Code rule on cyclists' clothing and helmets. It says cyclists should wear a helmet that meets current regulations, fits and is securely fastened, and that evidence suggests a correctly fitted helmet will reduce the risk of head injury in certain circumstances; as a "should" rule it is guidance, and there is no legal requirement for adult cyclists to wear a helmet in Great Britain. Northern Ireland's Code has the same advice. Cycling UK, a charity, argues the helmet reference should be removed because it leads to victim blaming. (Road rules for cyclists)

S

Saddle rules (UCI)

UCI Articles 1.3.013 and 1.3.014, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide: the tip of the saddle must be behind a vertical line through the centre of the bottom bracket, the saddle may tilt at most nine degrees from horizontal, and it must be 24 to 30 cm long. The guide says commissaires carry a device to measure saddle angle and check when in doubt. (UCI equipment rules)

Saddle sores and saddle pressure

Conditions named by Thompson and Rivara (American Family Physician, 2001): saddle sores range from minor skin irritation to ulceration, and saddle pressure can cause genital numbness or tingling (pudendal nerve symptoms). A suspected injury or condition needs medical care. (Injuries named)

SafeR

The UCI-backed structure for safety in professional road racing, bringing together organisers, teams, riders and the UCI; UCI President David Lappartient dates its launch to 2023. It has a Supervisory Board, a Commission and a Case Management Committee, and the UCI keeps a race incident database with Ghent University, which recorded 497 incidents at UCI WorldTour, Women's WorldTour and ProSeries events in 2024. (Race safety and the UCI)

Safety bicycle

A bicycle layout that put the rider nearer the ground, with chain drive to the rear wheel so both wheels could be the same size. The Science Museum Group credits John Kemp Starley with the first successful one, the Rover of 1885, made in Coventry, and says the safety bicycle made cycling hugely popular with both men and women. (The safety bicycle and the pneumatic tyre)

Scratch race

An individual track race over a set distance, 10 km for elite men and women (UCI Part 3, version applying 1 January 2026, Article 3.2.173, as reproduced by the Japan Cycling Federation). It is the first of the omnium's four races. (Track cycling)

Six-day race

A track team race for teams of two or three riders (UCI Part 3, version applying 1 January 2026, as reproduced by the Japan Cycling Federation). (Track cycling)

Skinsuit

A one-piece racing garment combining a sleeved jersey and shorts, which UCI Article 1.3.026 allows in place of the two (as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide). The same rules forbid sleeveless jerseys and gloves built into a jersey or skinsuit, limit sock and overshoe height (Article 1.3.033 bis), and bar non-essential added elements that change the rider's shape (Article 1.3.033). (Clothing)

Snell B-90 and B-95

Bicycle helmet standards of the Snell Memorial Foundation, from 1990 and 1995. Both were among the standards accepted in the US interim rule of 1995, British Columbia's helmet regulation (B.C. Reg. 234/96) accepts them, and Australia's 2024 supply standard accepts B-95. (Helmet standards)

Sold Secure

A UK lock-testing body that says it was set up in 1992 by Northumbria and Essex Police with Home Office backing and is now run by the Master Locksmiths Association. Its pedal cycle grades, from highest, are Diamond, Gold, Silver and Bronze; it says its "Bicycle" rating was renamed "Pedal Cycle" in 2022 with no change to the ratings, and that insurers often name a required grade. (Locks and security)

Sprint (track)

A track race between two to four riders over two or three laps (UCI Part 3, version applying 1 January 2026, Article 3.2.029, as reproduced by the Japan Cycling Federation). A sprint competition starts with a 200 m flying-start time trial that seeds the riders, followed by rounds that end in best-of-three finals. (Track cycling)

Stage race

A race over at least two days with a general time classification, made up of road race stages and time trial stages (UCI Part 2, version on 1 July 2025, Article 2.6.001). A rider who abandons may not ride another event for the rest of that stage race without a UCI exception (Article 2.6.026). (Stage races and jerseys)

STAR (Virginia Tech)

The bicycle helmet rating of the Virginia Tech Helmet Lab, run with the Insurance Institute for Highway Safety: 24 impact tests per helmet at six locations and two energies, with each impact's concussion risk weighted by how often a cyclist might meet it, so that lower scores and more stars mean lower risk. Virginia Tech says the scores cannot be compared with its ratings for other sports and that even the best helmet cannot prevent all head injuries; the scores are laboratory estimates of concussion risk under defined impacts, not certification. (Independent helmet tests)

STATS19

The system through which police forces in Great Britain report road collisions to the Department for Transport; casualties reported within 30 days are included. The DfT says not all collisions reach the police, and that non-fatal cyclist casualties are among the most likely to be missed because cyclists are not obliged to report collisions. (What the casualty figures show)

T

Tandem

A bicycle for two riders. UCI Article 1.3.012, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide, allows a tandem up to 270 cm long. On the track the tandem is a sprint competition in which each pair counts as one participant (UCI Part 3, Article 3.2.184), and in para-cycling the B sport class races on tandems, a sighted pilot in front and the visually impaired athlete behind as the stoker (Cycling New Zealand). (Para-cycling)

Team classification

The team standings of a stage race. UCI Part 2 (version on 1 July 2025), Article 2.6.016, adds the three best individual times from each team on each stage, and Article 2.6.013 makes a team classification on time compulsory in the main stage races. (Stage races and jerseys)

Team pursuit

A track race between two teams of four riders starting on opposite sides of the track over 4 km, won by catching the other team or setting the faster time (UCI Part 3, version applying 1 January 2026, as reproduced by the Japan Cycling Federation). (Track cycling)

Team sprint

A track race between two teams of three riders over three laps, each rider leading for one lap, with qualifying against the clock (UCI Part 3, Article 3.2.144, text modified 12 June 2020, as reproduced by the Japan Cycling Federation). Sources differ on the women's event: a Cycling Weekly guide, seen only in a search summary, describes it as for pairs, while the UCI rule sets teams of three without distinguishing men and women. (Track cycling)

Team time trial

UCI Part 2 (version on 1 July 2025), Article 2.6.003, requires team time trial stages to come in the first third of a stage race; the UCI says a true team time trial first appeared at the Olympic Games in Rome in 1960. (Stage races and jerseys)

Technological fraud

The UCI's term for cheating with equipment, such as hidden motors. UCI Article 1.3.024 quater (introduced 15 February 2019), as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide, lets the UCI fit onboard devices to detect it, and refusing them can bring disciplinary measures; the UCI says its large-scale campaign against technological fraud began in 2016 and was reinforced in 2018. (UCI equipment rules)

Tempo race

A track race of 10 km for elite men and women (7.5 km for juniors) in which, after the first four laps, a sprint is held every lap with one point to the first rider; gaining a lap earns 20 points and losing one takes 20 away (UCI Part 3, version applying 1 January 2026, as reproduced by the Japan Cycling Federation). It is the second race of the omnium. (Track cycling)

Three-kilometre rule

UCI Part 2 (version on 1 July 2025), Article 2.6.027: riders delayed by a duly noted incident, such as a crash, puncture or mechanical problem, in the last three kilometres of a road stage get the time of the group they were with, but are placed in the order they cross the line; it does not apply to hill-top finishes. The UCI may extend the zone to 5 km for expected bunch sprints, and from 2025 the time-gap margin in bunch finishes rose from one second to three. Older press, including Cycling Weekly, cites the rule as Article 2.6.026; the 2025 edition numbers it 2.6.027. (Stage races and jerseys)

Time limit (stage races)

UCI Part 2 (version on 1 July 2025), Article 2.6.032: a rider who finishes a stage outside the time limit set in the race's own regulations is disqualified. Only in unforeseeable cases of force majeure may the commissaires extend it, and riders reinstated that way lose their points in the secondary classifications. (Stage races and jerseys)

Time trial bike

A racing bike for solo races against the clock that Wikipedia (secondary) describes as more aerodynamic than a road bike, with a shorter wheelbase and the rider placed nearer the front wheel. Wikipedia says triathlon bikes are similar but use a steeper seat tube angle and are not bound by the UCI saddle setback rule. (Bike types)

Time trial extension

The fixed handlebar extension with two forearm supports allowed in road time trials and the track individual pursuit, team pursuit and kilometre (UCI Article 1.3.023, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide). Its reach and height limits depend on the rider's height category: under 180 cm, reach up to 800 mm; 180 to 189 cm, up to 830 mm; 190 cm or taller, up to 850 mm, the taller categories only for riders on the UCI's published list. The UCI Management Committee confirmed in September 2025 that forearms may rest on the handlebar only in time trials on fixed extensions. (Time trial position rules)

Tour de France

The French Grand Tour, run in 1903 by the Paris sports paper L'Auto (formerly L'Auto-Velo), which announced it on 19 January 1903. What the paper was called that day is given three ways: Universalis says it was still L'Auto-Velo, EBSCO says a court case that January had made it L'Auto, and two Encyclopedia.com entries name Velo-Auto and L'Auto. Sixty riders left Montgeron on 1 July 1903 and Maurice Garin won. This history rests on Universalis and EBSCO because the organiser's own sites could not be read. After the 1904 race the French federation disqualified the first four finishers for race irregularities, not doping, and awarded the win to Henri Cornet; Universalis dates the ruling 2 December 1904, Wikipedia (secondary, search summary) 30 November. (How the Grand Tours began)

Tour de France Femmes

The women's Tour de France, launched in 2022 as a permanent stage race, according to Tour Magazin (7 August 2026). It follows a one-off Tour de France feminin in 1955 and an official women's Tour run from 1984 to 1989 by the Societe du Tour de France, won first by Marianne Martin and last by Jeannie Longo. (Women's racing history)

Trials

Riding over natural and mostly man-made obstacles without any part of the body, or any part of the bike other than the tyres, touching the ground or an obstacle, as the UCI defines it (2026). The UCI recognises 20-inch, 26-inch and Open categories by wheel size and dates its Trials World Championships from 1987. (BMX, trials and indoor)

Triple Crown

A phrase used two ways. The UCI calls Tadej Pogacar's 2024 wins in the Giro d'Italia, the Tour de France and the road world championship a Triple Crown achieved before only by Eddy Merckx (1974) and Stephen Roche (1987). The Giro d'Italia Women's organiser says Demi Vollering's 2026 Giro win completed her Triple Crown of all three women's Grand Tours. (Road World Championships)

Twist and go

An e-bike that can be propelled by the motor without pedalling. The UK government's information sheet (updated 10 December 2024) says such e-bikes placed on the market after 1 January 2016 generally need type approval, while a walk-assist mode up to 3.7 mph is outside type approval; Greater Manchester Fire and Rescue Service also says twist and go bikes need type approval, and nidirect says a bike that can be propelled without pedalling must be type approved. (E-bike classes and laws)

Two abreast

Highway Code Rule 66, as amended in 2022, says cyclists can ride two abreast and that it can be safer to do so, particularly in larger groups or with children or less experienced riders, while being aware of drivers behind. This records what the Code says, not how to ride. (Road rules for cyclists)

Tyre types (clincher, tubeless, tubular)

Tyre constructions named in the scope of ISO 5775-1:2023, which BSI says covers clincher, tubeless, tubeless-ready, tube-type and beaded-edge tyres but not tubular (sew-up) or non-pneumatic tyres. Wikipedia (secondary) says most gravel bikes use tubeless tyres because they resist punctures and pinch flats better than tubed clinchers. (Wheels and tyre sizes)

U

UCI Gravel World Series

The UCI's season-long series of gravel qualifying events. At the first Gravel World Championships in 2022, age-group riders qualified by finishing in the top 25 percent of their category at a series event (UCI); Wikipedia (secondary) says the first series had 11 races in ten countries. The series said in March 2023 that any bike is allowed at its qualifiers except e-bikes, time trial bikes, recumbents and tandems. (Cyclo-cross and gravel)

UCI (Union Cycliste Internationale)

Cycling's world governing body, founded in Paris on 14 April 1900 by the federations of Belgium, the United States, France, Italy and Switzerland after continental delegates walked out of an ICA congress, according to the UCI; The Canadian Encyclopedia also counts Canada's Canadian Wheelmen's Association as a founding member. Its headquarters are in Aigle, Switzerland. It said it had 206 affiliated national federations in September 2025 (its own figure) and, in April 2025, that it governs 11 disciplines (how it reaches 11 is unconfirmed); David Lappartient was re-elected president in September 2025. (The UCI)

UCI World Ranking

The UCI's ranking of riders, teams and nations. The UCI's final 2025 ranking put Tadej Pogacar first among men and Demi Vollering first among women. No final 2026 ranking had been published as far as our research found on 22 October 2026, so this site names no 2026 leader. (Rankings and the WorldTour)

UCI WorldTour

The top tier of men's road racing, which the UCI says it created in 2011 after the UCI ProTour of 2005; the UCI Women's WorldTour followed in 2016. Its calendars are set by the Professional Cycling Council (UCI Part 2, Article 2.1.001). For 2026 the UCI registered 18 WorldTeams and 14 Women's WorldTeams, with men's and women's top-tier licences awarded together for the first time for 2026 to 2028. (Rankings and the WorldTour)

UL 2849

A US safety certification for e-bikes. New York City's Local Law 39 of 2023, effective 16 September 2023, requires e-bikes sold, leased or rented in the city to be certified to UL 2849, other battery mobility devices to UL 2272 and their lithium-ion batteries to UL 2271 (NYC Department of Consumer and Worker Protection, 8 September 2023). (E-bike batteries and fire safety)

USADA

The US Anti-Doping Agency. On 24 August 2012 it announced a lifetime ineligibility for Lance Armstrong and the disqualification of all his results from 1 August 1998 (road.cc). The UCI said on 22 October 2012 that it would recognise the sanction and not appeal, and its Management Committee decided on 26 October 2012 not to award the 1999 to 2005 Tour wins to any other rider, so those Tours have no winner listed. (Doping and official decisions)

V

Velocar

The recumbent bike on which Francis Faure beat the Hour record in 1933. The date the UCI ruled it was not a bicycle is given two ways: Ahmed, Qureshi and Khan (2014) say the challenge succeeded at the UCI's congress of 3 February 1935, after which a new dimensional definition annulled its records, while popular histories seen only in search summaries give 1 April 1934. (The UCI and the governing bodies)

Velocipede

The pedal-driven bicycle of the 1860s, with pedals on the front wheel. Who invented it is disputed: the French account credits Pierre Michaux (Wikipedia, seen only in a search summary, names his son Ernest alongside him), while Pierre Lallement received the US patent for a pedal bicycle in November 1866; John Lienhard concludes the invention was communal. The University of Missouri Libraries say in April 2023 that it remains unclear who made the breakthrough. (The draisine and the velocipede)

Vuelta a Espana

The Spanish Grand Tour. Ara (26 August 2025) says the first edition was organised by the Madrid daily Informaciones, started on 29 April 1935 and finished on 15 May 1935, with 50 starters and 29 finishers, and was won by Gustaaf Deloor of Belgium. (How the Grand Tours began)

W

WADA

The World Anti-Doping Agency, founded in 1999 on the IOC's initiative (Larousse). (Doping and official decisions)

Wheel approval (UCI)

UCI Article 1.3.018, as reproduced in the Japan Cycling Federation's copy of the UCI clarification guide: only UCI-approved wheel designs may be used in road, track and cyclo-cross; wheels for mass-start road and cyclo-cross must have a rim no higher than 65 mm (for road from 1 January 2026) and at least 12 spokes; and "traditional wheels" (alloy rims under 25 mm high with at least 20 steel spokes) need no approval. Wheels must be 550 to 700 mm in diameter including the tyre. (Wheels and tyre sizes)

White jersey

The best young rider's jersey in the Tour de France, the Giro (maglia bianca) and the Vuelta. The ASO-linked L'Etape series says the Tour's is for riders aged 25 or under and was reintroduced in 1975; a 2011 blog, seen only in a search summary, said under 25, and the Tour's current regulations could not be checked. Wikipedia (secondary) says the Vuelta's has been white since 2019. (Stage races and jerseys)

World Championships (road)

The UCI's road title races. The UCI says the first, for amateurs, was held in 1921, the first professional title was won by Alfredo Binda in 1927, time trial championships began in 1994, and Kigali, Rwanda, in 2025 was the first held in Africa. The 2026 edition was held in Montreal, Canada, from 20 to 27 September 2026 (dates confirmed by the UCI). (Road World Championships)

X

XCC (cross-country short track)

A mountain bike race of about 20 minutes on a short course, whose results help set the cross-country start grid at World Cup rounds; the UCI says its first world championship was at Val di Sole in 2021. Its course length is given two ways by the UCI itself: about 1 to 2 km in its 2026 explainer, 1 to 1.5 km in a 2019 explainer. (Mountain biking)

XCE (eliminator)

A short head-to-head mountain bike format with its own world championships; the UCI Congress of September 2025 awarded the 2026 Eliminator World Championships to Barcelona. (Mountain biking)

XCM (cross-country marathon)

A long-distance cross-country format that the UCI says has its own world championships and joined the UCI Mountain Bike World Cup from 2023. (Mountain biking)

XCO (cross-country Olympic)

The Olympic mountain bike format: laps of a circuit typically 3.5 to 4.5 km long, with elite races of about 80 to 100 minutes, as the UCI defines it (2026). The UCI says it has been on the Olympic programme since Atlanta 1996. (Mountain biking)

XCR (cross-country team relay)

A mountain bike relay in which each team member rides one lap; the UCI says the first world title was raced in 1999 at Are, Sweden. (Mountain biking)

Y

Yellow card

A UCI sanction for offences that create a safety risk in road races, approved by the Management Committee in June 2024 for everyone in the race convoy, with the eligible incidents listed in Article 2.12.007. After a test from 1 August to 31 December 2024, the UCI announced that from 2025 two cards in one race mean disqualification and a seven-day suspension, with longer suspensions for three cards in 30 days or six in a year; it publishes the list of recipients weekly. (Race safety and the UCI)

Yellow jersey

The overall leader's jersey of the Tour de France, which the ASO-linked L'Etape series dates from 1919. Search summaries of press histories, which could not be opened, say Eugene Christophe first wore it on 19 July 1919 and that Philippe Thys claimed in a 1956 interview to have been offered one in 1913; neither account was confirmed from the organiser. (Stage races and jerseys)